Throttle-valve.



PATENTED JULY 25, 1905.

IN l/ENTbR JkrZert Ziof'tozz.

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H. M. LOFTON. THROTTLE VALVE. APPLICATION FILED 001. 29, 1904.

WITH/588E 00.

ATTORNEYS PATENT OFFICE.

UNITED STATES HERBERT M. LOFTON, OF ATLANTA, GEORGIA, ASSIGNOR TONATIONAL INVESTMENT COMPANY, OF SAVANNAH, GEORGIA, A CORPORATION OFGEORGIA.

Specification of Letters Patent.

. TH ROTTLE-VALVE.

Patented July 25, 1905.

To all whom it may concern.-

Be it known that I, HERBERT M. LoFroN, a citizen of the United States,and a resident of Atlanta, in the county of Fulton and State of Georgia,have made certain new and use ful Improvements in Throttle -Valves, ofwhich the following is a specification.

My invention is an improvement in valves, and particularly inthrottle-valves, and has for an object to provide a novel constructionwhereby a portion of the fed steam or other power fluid may be admittedto adesired point in advance of the passage of the main supply of suchpower fluid to its point of operation; and the invention consists incertain novel constructions and combinations of partsyas will behereinafter described and claimed.

In the drawings, Figure 1 is a vertical longitudinal section of a valveembodying my invention, and Fig. 2 is a detail perspective view of thevalve proper.

The casing A is preferably constructed, as shown, with a body B and atubular extension O, connected by threading at O with the body B andforming a way for the operatingshaft D. This extension C is providednear its outer end with an opening at C in which the shaft D turns, andwith an outwardly facing shoulder O against which rests the flange D onthe shaft D in the use of the invention. A cap E is threaded on theouter end of the tubular extension 0, encircles the shaft D at E, andoperates to compress the gasket F against the outer side ofthe flange Dof the operating-shaft D, said gasket F fitting within the outer end ofthe tubular eX- tension 0 of the valve-casing A and being of anysuitable compressible packing material. In practice I find vulcanizedasbestos desirable and prefer to employ such material for the purpose.By this construction it will be noticed I securely pack theoperating-shaft andprevent any escape of steam around the same.

The operating-shaft D is threaded at d at its inner end and turns atsuch end in the threaded bore G of the stem G of the valve G, whereby tooperate the said valve to and from its seat in the use of the invention,a screw g or other suitable projection on the casing entering a keywaygin the valve-stem G and preventing the same from turning withoutinterfering with its longitudinal movement in setting the valve G to andfrom its seat.

The valve-casing A is provided at H with a valve-seat for the valve Gand with an annular recess'I concentric with said seat and forming achamber from which leads a branch outlet '13, the main outlet J for thesteam being at the outer end of a cylindrical portion K of the casing,which cylindrical portion communicates at its inner end with the chamberI, is of less diameter than the chamber I, and extends outwardly to themain outlet J, where connection may be made in any suitable way with thepart to which it is desired to su ply steam. This cylindrical portion Kis 0 less diameter than the chamber I, and the valve G is provided onits discharge side with acylindrical portion G which fits the cylinder Kand is provided with a port or ports G which terminate at their innerends g at points within the cylin der K or out of register with thechamber I when the valve is closed and during the initial openingmovement of the valve, so that the valve may be opened to permit thepassage of the steam to the chamber I and thence out of the outletbranch 40 without permitting the passage of steam to the main outlet J.By this means steam may be permitted to pass from the branch outlet inadvance of passing to the main outlet, so that the supply I of steam maybe permitted to pass, for instance, to the inner ends of the blades ofrotary engines when it is desired to press such blades outwardly inadvance of permitting the passage of steam to drive the engine. Bypreference the ports G taper from their inner toward their outer ends,gradually widening toward their outer ends, so the valve maybe operatedto permit the passage of steam to a greater or less extent, as may bedesired, in the operation of the engine. I

The construction is simple, easily operated, and will be found toefiectively serve the purpose for which it is designed.

Another advantage of this construction is that by graduating the amountof steam passing through the V-shaped ports mentioned the main-valveseats are not cut by what is known as wire-drawn steam, as is the casewhere an ordinary disk valve is employed to regulate the amount of steamfed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The improvement in valves herein described comprising the casinghaving a body portion provided with a valve-seat, with a recess forminga chamber at the outer side of said seat, with a branch outlet leadingfrom said chamber and with a main outlet and a cylindrical portionbetween said main outlet and chamber and provided opposite saidvalve-seat with a tubular extension threaded in connection with the bodyportion of the casing and provided near its outer end with an openingfor the main shaft and outside said opening with an outwardly-facingshoulder, the main shaft having a threaded inner end and provided withan annular flange fitting against the outwardly-facing shoulder of thetubular extension, the packing-gasket against the outer side of saidflange and the cap threaded on the outer end of the tubular extensionand compressing the packinggasket, the valve fitted to the seat of thecasing and provided on its inner side with a stem keyed to and movablelongitudinally within the tubular extension of the casing and threadedinternally to receive the threaded end of the operating-shaft, saidvalve being provided on its outer side with a cylindrical portionfitting the cylindrical portion lying between the main outlet and thechamber of the casing and provided in said cylindrical portion with anoutlet port or ports which terminate in the initial opening movement ofthe valve at a point clear of said annular chamber, whereby the branchoutlet will be supplied with steam or power in advance of the mainoutlet substantially as set-forth.

2. The improvement in valves herein described comprising the casinghaving a valveseat, anda branch outlet and main outlet beyond said seat.and a valve proper fitted to the seat of the casing and having aprojecting portion controlling the main outlet and adapted to open thesame subsequent to the opening of the valve to permit the passage ofpressure to the branch outlet substantially as set forth.

3. The combination of the casing having a valve-seat, a chamber at theouter side of said seat and having a branch port in communication withsaid chamber and a cylinder extending beyond said chamber and a valvefitted to the seat of the casing and having at its outer side aprojecting cylindricalportion fitted to the cylinder of the valve andhaving a port or ports arranged for operation substantially asdescribed.

4. A valve comprising a casing having a main outlet and a branch outlet,and a valve proper provided with means for controlling the main outletand branch outlet and operating to open the main outlet subsequent tothe opening of the branch outlet substantially as set forth.

5. The combination in a valve with the casing having a valve-seat, anannular chamber at the outer side of said seat and a cylindrical portionof less diameter than the annular chamber and extending thence toward amain outlet and provided with a branch outlet communicating with theannular chamber and the valve proper having at its outer side aprojecting cylindrical portion fitted to the cylindrical portion of thecasing and adapted to control the passage of pressure to the main outletsubstantially as set forth.

6. In a valve a casing having a valve-seat, a branch outlet anda mainoutlet beyond the same, a valve proper fitted to the seat of the casingand controlling the passage of pressure to the branch outlet, said valveproper being provided with means controlling the passage of pressure tothe main outlet and arranged to open the main outlet subsequent to theopening of the branch outlet substantially as set forth.

7. A valve substantially as herein described comprising the casinghaving a valveseat and a valve fitted to said seat and having at itsouter side a cylindrical extension imperforate adjacent to the valve andpro vided between said valve and its outer end with an opening oropenings forming ports for the passage of pressure, the casing having amain outlet and a branch outlet substan tially as and for the purposesset forth.

8. The valve herein described comprising the casing having a valve-seatand a valve fitted to said seat and having at its outer side acylindrical extension imperforate adjacent to the valve and providedbetween said valve and its outer end with a tapered opening or openingsforming ports for the passage of pressure, substantially as and for thepurposes set forth.

9. The valve herein described, comprising the casing having a valve-seatand beyond the same a cylindrical portion and provided between thevalve-seat and the cylindrical portion with a branch outlet, and thevalve proper fitted to said seat and having at its outer side acylindrical extension imperiorate adjacent to the valve and providedbetween said valve and its outer end with a tapered opening forming aport for the passage of pressure, whereby the valve may be operated topermit the passage of pressure to the branch outlet in advance of thepassage of pressure through the tapered. opening to the main outlet,substantially as set forth.

' HERBERT M. LOFTON.

Witnesses:

SoLoN C. KEMON, PERRY B. TURPIN.

